It's fun dude, just talk to people (isn't that one of the reasons why we wanna do medicine in the first place???). From my experience, it helps ease the tension of interview day. You get to talk to random people and hear about their lives; you're basically practicing for the interview question "tell me about yourself"...so I don't see why you wouldn't want to talk to people. IMO. I had some nice people in my interview, and it's a mini support network (we were all cheering for each other as we entered our interviews, and talked about it extensively afterwards. lots of camradery, pretty sweet). I mean no one I've met is "gunning" (whatever the heck that means), and it's pretty much worthless to be "gunning" as an applicant who hasn't even been judge by the interviewer. Additionally, unless you're completely incompetent, there is absolutely no way anyone can psych you into having a bad interview (again, unless you're completely socially and mentally inept).
But in the end, it's up to you. If you feel you have to speak to no one to have a good interview, do just that. But if you're confident that you can interact with people and still have a good interview, I'd suggest that, since the majority are capable of doing this.